code: def _affine_inputs(fn):
      assert isinstance(fn, Funsor)
      return frozenset()
  
file_path: funsor/funsor/affine.py
imports: from collections import OrderedDict
  from functools import reduce, singledispatch
  import opt_einsum
  from funsor.domains import Bint
  from funsor.interpreter import gensym
  from funsor.tensor import Tensor, get_default_prototype
  from funsor.terms import Binary, Finitary, Funsor, Lambda, Reduce, Unary, Variable
  from .None import ops
label_desc: Use image node_id 4 for calling a global function with example usage: _affine_inputs(fn) and returns: frozenset